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#include <iostream>
using namespace std;




void solve(){
  int n, res=0, t=1;
  char c;
  cin>>n;
  int x=n/10;
  for(int i=1; i<=n; i++){
        cin>>c;
        if(c=='N')t=0;
        if(i%x==0){
            if(t==1){res++;}
            t=1;
        }

  }
  cout<<res;
}



int main()
{
    cin.tie(0);
    cout.tie(0);
    ios_base::sync_with_stdio(0);
    solve();
    return 0;
}